Electric heater.



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ELECTBIO APPLIOATIOH FILED RN. '1, 1910.

Paienmd Jan. 153, 11, 11.

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UNITED STATES PA'IIT'ENT OFFICE MILTON H. SHOENBEBG, OF SAN FRADICISGO, CALIFORNIA, ASSIGIJOR- TO IERESTQ ELEC- TRICAL MANUFACTURING COMPANY, 01? lilAN FRANCESCO, CALIFORNIA, ll. CGRTPO RATION 0F CALIFOR'NZA.

ELECTRIC HEATER.

Patented Jan. 16, 1911.

Application filed November '7, 1910. Serial No. 591,0415.

To all whom it may concern: lie it known that I, 'llllI/FON H. SIIOEN- nnim, a citizen of the United States, residing at lrlan Francisco, in the countyot Son l raneiseo and State of California, have in vented new and useful Improvements in Electric Heaters, of which the following is a spocificmzioi'i. A

My invention relates to electrical hosting Vessels, and is particularly adapted to heating liquids.

()ne ot the objects of my invention to provide a. construction which can he connected to an ordinary electric lighting circult and which will prickly heat a quantity of water or other liquid.

()ne oi. the main features of my present invention is the arrangement by which a limited quantity of hot liquid is ohl'ainiird almost iirnnodiatcly and. before the entire body of liquid in the vessel has become heated.

With these objects in View, reference is made to the itolle-wing description for a complete understanding of the invention, in connection with the accon'iponying drowings, in which-.

Figure 1 is a. perspective view oi. an electrical heating vessel eniloodylire my invention and having a portion of the liquid receptacle broken away to show the manner of connecting; the electric heating element; Fig. 2 is a. longitudinal sectional view oi one form of the heating element; and Fi 3 is a longitudinal section through a. portion of the spigot and its extension and showing the heater in dotted lines to inclicate the manner of assembling; the parts.

In the d 'awings, 1 have indicated a liquid containing vessel or receptacle 1, which may he of any suitable size and shape and may he supported upon a stand or base 2. The vessel may be provided with a removable cover 4, which may conveniently have a separable cap 5, which can he removed for the purpose of filling the vessel without disturbing the main cover A faucet or tap 6 is secured to the receptacle near the bottom for the purpose of drawing oil the hot liquid.

As previously pointed out, one of the main features of my invention is the arrangement by which hot licuid may be drawn ofi' almost immediately alter the electric Current is turned onto the heating element, and before: the body of the liquid 1s heated. Instead oi;

i'ht .ncet passog'e.

i s nereino'l'ter explained, the interior cos ing wall 12 of the heater subjected to on urense heat by the re. .ance element-,- and will my quickly heat a small. volume or" water missing through the heater. It the stern 15 of the faucet he turned so that :1 small stream only may flow, the liquid will he raised to a. higrh tmnporaturo at once, without Waiting; for the body the liquid to become heated. For many purposes my ap niratus mayhe thus employed as an ill", sl'zmtanmus heater and it will only neces sary to switch on the electric current. during; the shortperiod that the liquid is being drawn oil. If the current is permitted to continue tl'irouglrthe heater, the entire hotly of the liquid in the receptimle Will soon hecoine hot and will he u'iaintoin'ed in this condition, As it is essential that there should he continual circulation tln'ough the interior passage or? the heater, 1 nmke the here of the heater slightly larger than the extension 8, so that there shall he a smell crevice between the inner wall 12 and the tubular extension 8. and also provide several small channels 15 through the end l'lai'rge 16, the latter serving to prevent the heater from coming into contact with the wall of the receptacle when it being slid into position over the QXliGIL- sion 8.

'lhe electric heater comprises a tubular lasing having concentric outer and inner walls 11, 12, torinin on interior annular cavity which is tightly sealed at the ends by means of caps 17, 18, and inte posed washers 20, which may he ot mica. The inner sleeve or tube 12 is\ preferably brazed or otherwise secured at one end to the cap 18, the cop and inner tube being removable from the outer tuhe 1.1. The heating device comprises a resistance element of high rcsistance wire 22, mounted upon but insulated by. means of some refractory material from the inner tube 12. I prefer to make the resistance element in the form of a helix or spiral embedded in a porcelain tube 28, the Whole constituting a heating unit which may he slipped over the timer tube before the the bore oi which forms a continuation of t parts are assembled. After the inner tube carrying the resistance element has been in serted in the outer tube 11, the ca 17 is screwed over the threaded end oft e tube 11, and securely seals the interior annular cavityn The ends of the resistance wire 22 are connected with the leads or conducting wires 25, which; pass to the outside of the receptacle throu' h a tube 26, connected with the outer casing wall and passing through an opening provided inthe cover 4, the leads being connected to a terminal plug 27 adapted to be connected to any ordinary electric light socket. I

The receptacle may be filled with liquid by removing the cap 5 of the cover. When it is desired to clean the receptacle, the heater 10 is first slid ofi of the extension member 8, and may then be fitted with the cover 4.

The many advantages of my invention will be apparent from the foregoing descrip tion. The heater may be employed to maintain the liquid in the receptacle hot. The heat is radiated from both the exterior and the interior walls of the heater casing, and a constant circulation of liquid is maintained through the bore or passage of the heater, 1 thus permitting the resistance unit to be maintained at an intense heat without endangering the integrity of the heater, and enabling it to be operated at a very high efiiciency. By properly graduating the flow of liquid through the faucet, hot liquid may be drawn 01f almost immediately after the electric current is switched onto the heater. I Again, the body of the liquid maybe maintained at a certain temperature while that which is drawn oil may be raisedto a higher temperature. The many uses to which my apparatus may be applied will suggest themselves to restaurateurs, druggists, and others who dispense hot liquids, as well as the householder.

\Vhile I have described in detail thestructure shown in the drawings to illustrate one i embodiment of my invention, it will be apparent to skilled artisans that many alterations and modifications may be made in the structure without departing from the spirit and scope of the invention. I therefore do not wish to be limited to the s cific uses or to the specific construction li drein disclosed.

I claim as new and desire to secure by Letters Patent- 1. An apparatus for heating liquids comprising a receptacle, a faucet connected r thereto, and an electric heater having a tubular passage extending therethrough said passage forming a direct continuation of the faucet passage;

2. An apparatus for heating liquids comprising a receptacle, a faucet connected thereto, an electric heater having a tubular passage extending therethrough and forming a continuation of the faucet passage and means for maintaining a circulation of liquid through the heater passage'when the faucet is closed.

8. An apparatus for heating liquids comprising a receptacle, a faucet connected thereto and having an inner tubular extension projecting into the rece tacle, a heating device comprising a tubu ar casing having inner and outer concentric walls open at both ends and having the bore thereof fitting over said extension, a tubular stem projecting from said casing, a resistance element within the cavity between said-walls and insulated therefrom, said cavity being closed at both ends, and electrical conductors connected with the terminals of said element and extending through said stem.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

MILTON H. SHOENBERG.

Witnesses F. P. Fos'rnn, L. Annnsnonrnn. 

